Ok. For a one-man situation there is not much benefit of a shared cache
such as Squid as your browser already caches things for you.

The main benefits of a shared cache is sharing of cached content among
multiple users.
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> Do I need to do anything to increase the cache size
> other than editing squid.conf?[/color]

No, but you may want to see the Squid FAQ section on memory usage.. the
bigger your cache the more memory Squid uses.
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> What sort of bandwidth savings should I expect to see
> for my situation?[/color]